How to create plugin and plugin appear in node repository

Hi Knime Team,

I have created a bunch of custom knime nodes and when I run those nodes then those appear in Node Repository individually but I want to group them in a single component like IO,Database,... etc and then inside that super component my subcomponent should appear just like a tree structure :-







here I have mentioned the predefined node name which has been given by the knime but In my project those will be mine custom components.
how to create plugin jar file and where to place this plugin jar file with dependency jar files and where to register/change any file for appear the component.

Please help me on it.

You need to edit your plugin.xml to put the node at the correct point. You may also need to add the categories to the extension point.